1664026496533 has 4 divisors (see below), whose sum is σ = 1665772590348. Its totient is φ = 1662280402720.

The previous prime is 1664026496527. The next prime is 1664026496611. The reversal of 1664026496533 is 3356946204661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1082251137969 + 581775358564 = 1040313^2 + 762742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664026496533 - 2⁵ = 1664026496501 is a prime.

It is a super-2 number, since 2×1664026496533² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664026493533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 873045478 + ... + 873047383.

It is an arithmetic number, because the mean of its divisors is an integer number (416443147587).

Almost surely, 2^{1664026496533} is an apocalyptic number.

It is an amenable number.

1664026496533 is a deficient number, since it is larger than the sum of its proper divisors (1746093815).

1664026496533 is an equidigital number, since it uses as much as digits as its factorization.

1664026496533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746093814.

The product of its (nonzero) digits is 16796160, while the sum is 55.

The spelling of 1664026496533 in words is "one trillion, six hundred sixty-four billion, twenty-six million, four hundred ninety-six thousand, five hundred thirty-three".